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　　Dreams Let us begin by saying what does not cause our dreams. Our dreams do not com e from "another world". They are not messages from some outside source. They are not a look into the future, either. All our dreams have something to do with our emotions, fear, longings, wishe s, needs and memories. But something on the "outside" may affect what we dream. If a person is hungry, or tired, or cold, his dreams may include a feeling of th is kind. If the covers on your body, such as a blanket, have slipped off your be d, you may dream that you are sleeping or resting on the ice or snow. The materi al for the dream you will have tonight is likely to come from the experiences yo u have today. So the subject of your dream usually comes from something that has effect on you while you are sleeping and it may also use your past experiences and the wi shes and interests you have now. This is why very young children are likely to d ream of fairies, older children of school examinations, hungry people of food, h omesick soldiers of their families, and prisoners of freedom. To show you how that is happening while you are asleep and how your wishes o r needs can all be joined together in a dream, here is a story of an experiment. A man was asleep and the back of his hand was rubbed with absorbent cotton. He would dream that he was in a hospital and his charming girl friend was visiting him, sitting on the bed and feeling his hand softly. There are some scientists who have a special study of why we dream, wha t we dream and what those dreams mean. Their explanation of dreams, though a bit reas onable, is not accepted by everyone, but it offers an interesting way of dealing with the problem. They believe that dreams are mostly expressions of wishes tha t did not come true. In other words, a dream is a way of having your wishes carr ied out.
　　1、The word !material" (para. 2) can be best replaced by__B__
　　A.wish.
　　B.source.
　　C.message.
　　D.cause.
　　2、The word !it" (para. 3) refers to the__D__
　　A.dream.
　　B.sleep.
　　C.feeling.
　　D.subject.
　　3、It is implied in the passage that___A_
　　A.our dreams cannot predict correctly what may happen to us in the future.
　　B.our dreams can be anything except past experiences.
　　C.one is most likely to feel cold while sleeping without a blanket.
　　D.one with poor memory had fewer dreams than people with a good memory.
　　4、According to the experiment described in the passage, the man’s dream was caused by__A__
　　A.what the back of his hand was feeling at the moment.
　　B.his fear of an operation.
　　C.his girl friend he has just visited.
　　D.the hospital in which he was treated.
　　5、According to the writer, the explanation of dreams that some scientists made__C__
　　A.is considered interesting, but meaningless.
　　B.gives a good answer to the question why we dream.
　　C.has some value, though not fully convincing.
　　D.has been proved by the findings of their studies.